JohnR wrote: ↑11 Apr 2024, 7:03pm
Psamathe wrote: ↑11 Apr 2024, 1:19pm
Assuming start and end speeds the same, that means there is 981 joules will turn into heat irrespective of what sort of braking system you have.
The aerodynamic drag is part of the energy conversion into heat although we don't notice it at cycling speed. It's another matter if re-entering the earth's atmosphere from space.
True, just as brakes, dragging feet, etc. but none of that affects the amount of energy, only the means of its conversion.
Aerodynamic drag is a form of braking system eg a parachute in your example of re-entering the Earth's atmosphere.
My response was in the context of
Bmblbzzz wrote: ↑11 Apr 2024, 12:55pm
Psamathe wrote: ↑9 Apr 2024, 8:02pm
...
For a given hill the energy needing to dissipated will depend on the mass (rider, cycle, etc.), the potential energy. So my <60 Kg on an unladen carbon bike with BB7s will have a lot less energy to dissipate than a >100 Kg rider fully laden with camping gear, 2 days water riding a more than solid steel bike with BB7s.
Very different amounts of energy being dissipated through the same braking systems.
So I'd expect any steady state speeds to vary significantly.
Ian
Surely it will also vary with rotor size and material, caliper and pad design, ambient temperature, wind direction and speed... even direction of sun relative to rotors... Far too many factors to give one speed.
highlighting that the energy is from mass, height and gravity and has nothing to do with braking systems or wind resistance, etc. Brakes, wind resistance, etc. are just the means of conversion and don't affect the amount of energy.
(Think I'm going to give up repeating myself as people keep responding to my posts with unrelated stuff),
Ian